Computer Chess Club Archives




Subject: Re: Rybka uses PVS and not MTD(f). Its no Fruit-Clone

Author: Vasik Rajlich

Date: 10:03:16 12/12/05

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On December 12, 2005 at 07:26:38, Chrilly Donninger wrote:

>On December 12, 2005 at 05:19:49, Ryan B. wrote:
>>On December 12, 2005 at 04:58:52, Chrilly Donninger wrote:
>>>I did not follow the CCC-discussion the last months/years. So please do not
>>>"kill" me if I am telling old stuff. I got questions about Rybka from the
>>>Hydra-sponsor so I read yesterday evening some of IM Vasik Rajlichs very
>>>interesting postings in the archive.
>>>Vasik mentions several time MTD(f) and his experience with it. But when playing
>>>with Rybka, it looks like a normal PVS-search. I looked therefore also in the
>>>Rybka-Code. What I have seen so far is typicall PVS-Code.
>>>From this first look I can say that Rybka is not at all a Fruit clone.
>>You could look at Fruits source or just read the readme files :)
>Well, for Fruit one has to know C. Quite a problem for an old Assembler-Hacker.
>But in contrast to Frans Morsch I am in the meantime used to C.
>Rybka is somewhat easier. There one can directly read the machine/assembler
>code. No retranslation from C to Assembly is necessary :-)
>Rybka is obviously written in C. It looks like gcc was used for compiling. The
>code is not particullary well optimized. Maybe the Rybka team can buy from the
>first royalities a professional one from Intel or Microsoft.

Not to mention an encrypter :)


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